Appliance for making dental castings.



A. P. LEE. APPLIANOE FOR MAKING DENTAL CASTINGS.

vPatented May 4, 1909.

lAPPLIIATION FILED .TUNE 16,1908.

UNITED sriirns rnrniarfiinicn y ALFRED P. LEE, F PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO JAMES W. IVORY, 0F

PHILADELPHIA, PENNSYLVANIA.

APPLIANCE FOR MAKING DENTAL CASTINGS.

Specification of Letters Patent.

Patented fray 4, 1909.

Appucazion mec :une 16, reos. serial No. 438,739.

' W -ch the followin is a specification.

My invention re ates to an appliance for.

making dental-castin'gs such' as inlays', crowns, bridges, etc., andconsists of novel means for reproducing an im ression of a cavity in atooth orother denta requirement from fused gold or other metalsubjectedto pressure of automatically created as or vapor, so as tocompletely fill the mo d and be compressed therein, and for directingsaid gas or va or after use from the chamber'containing t e same intothe atmosphere.

It also consists vof a novel device for forming a chamber in the moldeneemployed.

For the purpose of explaining my invention, the accompanying drawingillustrates a satisfactory reduction of the same to practice, but theimportant instrumentalities thereof'may be varied, and so it is to beunderstood that the invention is not limited to the specific arrangementand organization shown and described.

Figure 1 re resents a perspective view of an appliance or dentalcastings embodyin the invention. Fig. 2 represents Aa partia sideelevation and partial vertical section thereof. Fig. 3 represents. aperspective view of the investment base and yone of the flasks employed.Fig.,4 represents a vertical section of a portion of the investment baseon an enlarged scale, including attachments. Fig. 5 represents avertical section of the flask, portion ofthe investment base, andappliances. Fi 6 represents a vertical section of the flask a terremoval from the investment base. Fig. 7 representsA a vertical sectionof a former em loyed forlproducing a chamber in the mo dene. Fig. y8represents a section of the impression of a cavity and the gate patternpin impaled thereon.-

Fig. 9 re resents a perspectivel view of the moldeneormer shown m Fig.7. Fig. 10 represents a side elevation o the product.

Similar letters of reference indicate corresponding parts in thefigures.

Referring to the drawing z-A designates a base, in which is the cavityB, which is occupied by the pad C of asbestos or other suitablematerial. Superimposed on said the stand, While is the ring D, in whichare perforations which form air vents for a purposeto be. hereinafterdescribed. y

' Rising from the base A, are ythe ears F, on which is mounted the leverG, depending from which is the inverted, cu H, which'is adapted toreceive and hol-` a body of lmoldene, as .at J, which is formed'of clay,

glycerin and other material, and having in pad and inclosed by the wallof said cavif.- a

ccl

its underside the chamb'er K, which, in the .f

present case, is produced by the former L, Whose to M is convex andwhich may be, containe in the casing N, the latter being adapted to beplaced on the pad C and set true within the rin D, after Which the leverG is lowered, w ereby the moldene is pressed against the top of theformer, thus compressing said material and formmg chamber K therein.

P designates an investment-stand, on which are supported the conicalpatterns Q.,

which are fixed ythereto and have vertical -i openings R centrallytherein to rece1ve the gateatternins S, which are removable there om anhave oints T on their upper ends and shoulders D below the same.

V designates a flask, whichis open at top and bottom and adapted to beplaced on the i stand P, as in Fig. 3,. and subsequently on the base A,as in Figs. l and 2as will be v hereinafter more fully explained.

On the stand P areclips W, which are adapted to embrace the kflask V andretain the same firmly and steadily inposition on permitting the removalof the same therefrom.

Fig. 3 shows the stand as vadapted foruse with a lurality of flasks, butto the same II do not imit myself.

The horizontal diameter. of the former L is that of the flask V, so thatin producing the chamber K the top rim of the flask V will enter the cupH, and bear upwardly against the base of the moldene in the cup,lso'thatwhen the lever is lowered, as 1n Fig. 2, the lower edge of saidcup overlaps the` u per edge'of the flask and renders t e cham er K iafrand gas tight, especially isL this the case since the top of the formerL has a shoulder M at the base of the convex top M, the contour of saidshoulder being imparted to the base of the moldene Jin the. cup Hproducing the recess J, so that the top rim Iof the'flask V enters saidrecess, and

X thereof, the same t the pattern Q, S. An investment or invest- `thuscovering said inpression X, and porin the investment ment material Y isnow poured into the flask,

tions of the atterns and pins S. hen said materia is set,lit remainsfirmly in the flask owing to the pin or screw Y', which is passedthrough the wall of the flask into said material, the flask then beingcarefully raised and removed from the stand P, when the pattern Q andpin S will remain on the latter, while the -im ression X is containedthe place occupied by the pattern-pin. Snow producing in said investmentthe gate Z, and that occupied by the pattern Q producing the chamber Zbelow said gate. The flask is now subjected to heat, whereby the waximpression X ,will melt and flow outof the investment producing the dieZ2 in lieu thereof, as shown in Fig. 2. The hot flask is then invertedand placed on the pad C, and retained true in position by the ring D,the lever G having been raised. A button of gold is nowplaced on thebase of the chamber Z, which 1s above, and subjected to a white heat, soas .to fuse, whereby lit may flow throu h the gate Z into the die Z2,when the lever is lowered tightly against.

the top of the flask V, see Fi 2. As the investmentv Y hasbecome higheated, a gas is generated therefrom. T 's mingles with that from thegold or metal, the gases occu ying the tightly-closed chambers Z',

K, t e expansion of which in said chambersexertin pressure on the fusedmetal, thus firmly orcing the latter into the die Z,z and producing acasting V2, in the present case that of an inlay, the same havingtherein a neck V3, which is subsequently removed when the casting isinserted into the cavity of a tooth for further manipulation by thedentiste The gas in the chamber K, Zlr

gradually escapes into the `atmosphere through the investment Y and padC, which are somewhat porous, and from the, latter through the vents Ein the ring D, which latter is superimposed on said pad., as previouslystated.

It will be seen that the ou .H is carried by the lever G asa plunger anmovable therewith, the matrix-'holder is dis osed in the di rection ofthe movement of t e plun er and the cup carried .thereby and constant yplastic non-porous material is said cup.

It` will be seen also that there is a one-piece mold having a hollow toreceive the metal to'be cast, a depression in the exterior surface ofthe mold which forms a Crucible and a sprue-opening or gate directlyconnecting the depression to the hollow, and furthermore that I employmaterials having surfaces to provide mold and crucible cavities, thelatter being directly connected by a sprue-opening or gate, said partsbeing so constructed and related that molten'metal may be forceddirectly from the crucible cavity into the mold-cavity by a singleaction.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In an ap liance of the character stated, a cup adapte to receivemoldene, means for coperation'with said cup, including a flask, ayielding support for the flask, and means for cooperation with saidflask to close the upper end'thereof.

2. In an appliance of the character stated, a cu adapted to receivemoldene with a shoulller, a yielding pad, a flask adapted to besupported upon said pad beneath said cup, and means embodying aperforated rm for closing the jointbetween said cup an flask renderingsaidchamber air and gas ti ht. i

g3. In an a pliance of the character stated, a base, a pad) on saidbase, a ring on said Vpad .and having perforations, a lever mountedthereon, an inverted cup on said lever, and a flask, the latter beingadapted to be suported on said base beneath said cup and to lie closedat top'by the same.

4. In an appliance of the character stated,

an investment base, a flask adapted to be sustained thereon, and aperforated ,ring on said base adapted to engagethe side of said flask tohold the same in operative position. 5. In `an appliance of thecharacter stated,

an investment base, a perforated ring, a pad supporting said ring, aflask adapted to be supported thereon and receive an investment `in saidflask for forming a chamber and gate in the investment ,and leaving theshaped dental-impression in the latter.

6. In an appliance of the character stated, `a flask which is"openI attop andlbottom and adapted to contain an investment, a vent a bas, a padthereon, a perforated ring on said pad, anda flask adapted to rest onsaid pad Within said ring.

8. In an appliance of the character stated, a flask, a gas chambertherein, and a gassk, and

discharging vent in communication with said prismg u plunger, n cupcarried by the chamber through the flask and opening into plunger andmovable therewith, ai matrix the atmosphere. holder disposed inLhedirection of movement El. .ln un appliance of the character stated,ol the plunger and the cup carried thereby. a bese, n pad, l(ind :l ringthereon,l and n und constantly plastic non-porous nmterinl llnsk adaptedto be supported on seid paid within he cup. with said ring, said ringhaving n vom therein adapted to discharge gals or vapor from said flaskt-hrou fh seid pad. f 1U. ln ai device of t 1e class described conf-ALFRED l. LEE. itfl lessee Jolis Wilcnnnsnnm Umani (i, DAL'roN.

